Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 127 insertions, 0 deletions

diff --git a/Src/Wasabi/api/config/items/attrcb.h b/Src/Wasabi/api/config/items/attrcb.h
new file mode 100644
index 00000000..3aa0e41d
--- /dev/null
+++ b/Src/Wasabi/api/config/items/attrcb.h
@@ -0,0 +1,127 @@
+#ifndef _ATTRCB_H
+#define _ATTRCB_H
+
+#include "attribute.h"
+
+/**
+  Enables you to register callbacks on
+  a specific attribute to monitor if it's
+  value has been changed by the user or other.
+
+  This class is not meant to be used on it's own.
+  Please derive from it instead.
+  
+  @short Attribute callback
+  @ver 1.0
+  @author Nullsoft
+  @see Attribute
+  @see int_attrCB
+  @see _int
+  @see _float
+  @see _string
+  @see _bool   
+*/
+class AttrCallback {
+public:
+  /**
+    Does nothing.
+  */
+  virtual ~AttrCallback() {}
+  
+  /**
+    Event triggered when the value of the attribute,
+    for which this callback has been registered, changes.
+    
+    This is a pure virtual, please override to implement
+    your custom behavior.
+    
+    @param attr Attribute for which the value has changed.
+  */
+  virtual void onValueChange(Attribute *attr)=0;
+};
+
+/**
+  Enables you to register callbacks on a specific
+  integer or boolean attribute to monitor if the
+  value has been changed by the user or other.
+  
+  @short Integer or Boolean attribute Callback.
+  @ver 1.0
+  @author Nullsoft
+  @see Attribute
+  @see _int
+  @see _bool   
+*/
+class int_attrCB : public AttrCallback {
+  typedef void (*fnPtrType)(int);
+public:
+  /**
+    Upon construction, you must specify which
+    function will be called when the value of
+    the attribute has indeed changed.
+    
+    This is done using a pointer to the function.
+    The function must accept one parameter of type
+    int, like so: void myfunc(int val);
+    
+    @param _fn Pointer to the function to use on value change.
+  */
+  int_attrCB(fnPtrType _fn) { fnptr = _fn; }
+  
+  /**
+    Event triggered when the value of the attribute,
+    for which this callback has been registered, changes.
+    
+    Override this to implement your own behavior.
+    The default is to send the new value of the attribute
+    to a function which you specify upon construction
+    of this object.
+        
+    @param attr Attribute for which the value has changed.
+  */
+  virtual void onValueChange(Attribute *attr) {
+    ASSERT(attr->getAttributeType() == AttributeType::INT ||
+           attr->getAttributeType() == AttributeType::BOOL);
+    (*fnptr)(attr->getValueAsInt());
+  }
+private:
+  fnPtrType fnptr;
+};
+
+class string_attrCB : public AttrCallback {
+  typedef void (*fnPtrType)(const wchar_t *);
+public:
+  /**
+    Upon construction, you must specify which
+    function will be called when the value of
+    the attribute has indeed changed.
+    
+    This is done using a pointer to the function.
+    The function must accept one parameter of type
+    int, like so: void myfunc(const char *val);
+    
+    @param _fn Pointer to the function to use on value change.
+  */
+  string_attrCB(fnPtrType _fn) { fnptr = _fn; }
+  
+  /**
+    Event triggered when the value of the attribute,
+    for which this callback has been registered, changes.
+    
+    Override this to implement your own behavior.
+    The default is to send the name of the attribute
+    to a function which you specify upon construction
+    of this object.
+        
+    @param attr Attribute for which the value has changed.
+  */
+  virtual void onValueChange(Attribute *attr) 
+	{
+    ASSERT(attr->getAttributeType() == AttributeType::STRING);
+    (*fnptr)(attr->getAttributeName());
+  }
+private:
+  fnPtrType fnptr;
+};
+
+#endif